(CNN) – Chiara de Blasio, daughter of New York City Mayor-elect Bill de Blasio, has struggled with clinical depression and drug abuse, the 19-year-old revealed in a YouTube video posted Christmas Eve.

"I've had depression, like clinical depression, for my entire adolescence," de Blasio says in the video. "It made it easier, the more I drank and did drugs, to share some common ground with people that I wouldn't have. It didn't start out as a huge thing for me but then it became a really huge thing for me."